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Diffstat (limited to 'coroutine/ppc64/Context.S')
-rw-r--r-- | coroutine/ppc64/Context.S | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/coroutine/ppc64/Context.S b/coroutine/ppc64/Context.S new file mode 100644 index 0000000000..f8561e0e7d --- /dev/null +++ b/coroutine/ppc64/Context.S @@ -0,0 +1,89 @@ +; Based on the code by Samuel Williams. Created by Sergey Fedorov on 04/06/2022. +; Credits to Samuel Williams, Rei Odaira and Iain Sandoe. Errors, if any, are mine. +; Some relevant examples: https://github.com/gcc-mirror/gcc/blob/master/libphobos/libdruntime/config/powerpc/switchcontext.S +; https://github.com/gcc-mirror/gcc/blob/master/libgcc/config/rs6000/darwin-gpsave.S +; https://www.ibm.com/docs/en/aix/7.2?topic=epilogs-saving-gprs-only + +; Notice that this code is only for Darwin (macOS). Darwin ABI differs from AIX and ELF. +; To add support for AIX, *BSD or *Linux, please make separate implementations. + +#define TOKEN_PASTE(x,y) x##y +#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name) + +.machine ppc64 ; = G5 +.text + +.globl PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer) +.align 2 + +PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer): + ; Make space on the stack for caller registers + ; (Should we rather use red zone? See libphobos example.) + subi r1,r1,160 + + ; Get LR + mflr r0 + + ; Save caller registers + std r31,0(r1) + std r30,8(r1) + std r29,16(r1) + std r28,24(r1) + std r27,32(r1) + std r26,40(r1) + std r25,48(r1) + std r24,56(r1) + std r23,64(r1) + std r22,72(r1) + std r21,80(r1) + std r20,88(r1) + std r19,96(r1) + std r18,104(r1) + std r17,112(r1) + std r16,120(r1) + std r15,128(r1) + std r14,136(r1) + std r13,144(r1) + + ; Save return address + ; Possibly should rather be saved into linkage area, see libphobos and IBM docs + std r0,152(r1) + + ; Save stack pointer to first argument + std r1,0(r3) + + ; Load stack pointer from second argument + ld r1,0(r4) + + ; Load return address + ld r0,152(r1) + + ; Restore caller registers + ld r13,144(r1) + ld r14,136(r1) + ld r15,128(r1) + ld r16,120(r1) + ld r17,112(r1) + ld r18,104(r1) + ld r19,96(r1) + ld r20,88(r1) + ld r21,80(r1) + ld r22,72(r1) + ld r23,64(r1) + ld r24,56(r1) + ld r25,48(r1) + ld r26,40(r1) + ld r27,32(r1) + ld r28,24(r1) + ld r29,16(r1) + ld r30,8(r1) + ld r31,0(r1) + + ; Set LR + mtlr r0 + + ; Pop stack frame + addi r1,r1,160 + + ; Jump to return address + blr |